Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS5337744 A
Publication typeGrant
Application numberUS 08/091,873
Publication dateAug 16, 1994
Filing dateJul 14, 1993
Priority dateJul 14, 1993
Fee statusPaid
Publication number08091873, 091873, US 5337744 A, US 5337744A, US-A-5337744, US5337744 A, US5337744A
InventorsBrendan Branigan
Original AssigneeMasimo Corporation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Low noise finger cot probe
US 5337744 A
Abstract
A low cost, disposable oximetric sensor including a finger cot probe to facilitate either the transillumination or transreflectance and the detection of optical energy emitted towards a patient's finger without subjecting the finger to deformation. The finger is received within a receptacle having a cup-shaped closed end and an opposite open end that is rolled up upon itself and adapted to be unrolled longitudinally along the finger to form a tubular enclosure in surrounding engagement with the finger. An optical source and an optical detector are arranged in spaced axial alignment with one another at opposite sides of the finger so that optical energy transmitted by the source towards the finger is received by the detector for non-invasively indicating the saturation of oxygen within the patient's blood depending upon the magnitude of the optical energy detected. By virtue of the present invention, decoupling the optical path between the source and detector is minimized in the event that the patient moves his finger during testing.
Images(5)
Previous page
Next page
Claims(21)
Having thus set forth the preferred embodiment of this invention, what is claimed is:
1. A sensor for analyzing human tissue, said sensor having a body and comprising:
a first end of said body at which to receive some of the tissue to be analyzed;
a flexible opposite end of said body rolled up upon itself in a direction towards and spaced a first distance from said first end, said opposite end moved in a direction away from said first end to unroll said opposite end so as to surround said tissue, the unrolled end being spaced a substantially greater distance from said first end than the first distance between said rolled end and said first end;
electromagnetic energy source means carried by said first end to emit electromagnetic energy towards the tissue to be analyzed; and
electromagnetic energy detector means carried by said first end and arranged relative to said source means to receive the electromagnetic energy emitted by said source means, the magnitude of the electromagnetic energy received by said detector means providing information regarding said tissue.
2. The sensor recited in claim 1, wherein the first end of said sensor is cup-shaped to receive the tissue to be analyzed therewithin.
3. The sensor recited in claim 2, wherein said cup-shaped first end is coextensively connected to said rolled up opposite end, said opposite end being unrolled away from said first end to form a generally tubular configuration in surrounding engagement with said tissue.
4. The sensor recited in claim 1, further comprising holes formed through said first end to provide ventilation for the tissue received thereat for analysis.
5. The sensor recited in claim 1, wherein said electromagnetic energy source means is an optical source and said electromagnetic energy detector means is an optical detector.
6. The sensor recited in claim 5, wherein said optical source includes a pair of light emitting diodes that emit optical signals with respective wavelengths in the red and infrared ranges.
7. The sensor recited in claim 5, further comprising first and second cavities formed in said first end thereof, said optical source and said optical detector being received within respective ones of said cavities.
8. The sensor recited in claim 7, wherein said optical source and said optical detector are recessed within said respective cavities so as to avoid contact with any tissue to be analyzed that enters said cavities.
9. The sensor recited in claim 7, wherein said first and second cavities are arranged in spaced axial alignment with one another at opposite sides of said first end so that the tissue at said first end is transilluminated by optical signals emitted from said optical source.
10. The sensor recited in claim 1, wherein said opposite end thereof includes an elastic cuff to surround said tissue and thereby hold said sensor in engagement therewith when said opposite end is unrolled away from said first end.
11. The sensor recited in claim 1, wherein said first end thereof is thicker than said opposite end.
12. The sensor recited in claim 1, wherein said first and opposite ends thereof form a finger cot to receive and surround a human finger to analyze the blood circulating through the finger.
13. Apparatus for analyzing human tissue, said apparatus comprising:
flexible carrier means for engaging the human tissue to be analyzed at one side of said carrier means, said carrier means including electromagnetic energy source means to emit electromagnetic energy towards said tissue and electromagnetic energy detector means to detect the energy emitted by said electromagnetic energy source means; and
tissue receptacle means having a first end attached at a side of said carrier means opposite the one side thereof engaging said tissue and a flexible opposite end rolled up upon itself and adapted to be unrolled over said first end in a direction towards said carrier means so as to surround the tissue to be analyzed and simultaneously move said carrier means around said tissue such that said detector means is arranged relative to said source means to receive the electromagnetic energy emitted by said source means,
the magnitude of the electromagnetic energy received by said detector means providing information regarding said tissue.
14. The apparatus recited in claim 13, wherein the first end of said tissue receptacle means is cup-shaped curving away from said carrier means, said cup-shaped first end being inverted and thereby curving towards said carrier means to surround the tissue to be analyzed when the opposite rolled up end of said receptacle means is unrolled over said first end towards said carrier means.
15. The apparatus recited in claim 14, wherein the cup-shaped first end of said tissue receptacle means is coextensively connected to said rolled up opposite end thereof, said opposite end being unrolled over said first end to form a generally tubular configuration in surrounding engagement with said tissue to be analyzed, said carrier means being moved between said unrolled opposite end and said tissue.
16. The apparatus recited in claim 13, wherein said electromagnetic energy source means is an optical source and said electromagnetic energy detector means is an optical detector.
17. The apparatus recited in claim 16, wherein said carrier means also includes first and second cavities, said optical source and said optical detector received within respective ones of said cavities.
18. The apparatus recited in claim 17, wherein said optical source and said optical detector are recessed within said respective cavities so as to avoid contact with any tissue to be analyzed that enters said cavities.
19. The apparatus recited in claim 17, wherein said carrier means is planar, said first and second cavities located at opposite ends of said planar carrier means and arranged in spaced alignment with one another at opposite sides of the tissue to be analyzed when said carrier means is moved around said tissue so that said tissue is transilluminated by optical signals emitted from said optical source.
20. The apparatus recited in claim 13, wherein said carrier means and said tissue receptacle means form a finger cot probe, said receptacle means for surrounding a human finger to analyze the blood circulating through said finger.
21. A method for analyzing human tissue by means of a tissue receptacle having a first closed end and an opposite open end that is rolled up upon itself such that said first closed end and said opposite rolled up end are spaced a first distance from one another, said method comprising the steps of:
unrolling the rolled up open end of said receptacle away from said final end so as to form a tubular enclosure with said closed first end for surrounding said tissue, the length of said tubular enclosure between said unrolled open end and said closed first end being substantially greater than the first distance between said rolled up open end and said closed end;
locating a source of electromagnetic energy at one side of said tissue to be analyzed to transmit electromagnetic energy towards said tissue;
locating a detector of electromagnetic energy at the opposite side of the tissue to be analyzed to receive the electromagnetic energy transmitted by said source; and
computing the magnitude of the electromagnetic energy received by said detector from said source for providing information regarding said tissue.
Description
BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to an inexpensive, disposable oximetric sensor (e.g. a finger cot probe) that is non-adhesively attached to a human digit (e.g. a finger) to facilitate either the transillumination or transreflectance and the detection of electromagnetic (e.g. optical) energy through such digit to analyze the blood of a patient by calculating the concentration of blood constituents (e.g. the saturation of oxygen within the patient's blood) while minimizing potentially interfering noise artifact signals.

2. Background Art

To determine a characteristic within a space, electromagnetic energy is often transmitted through or reflected from a medium to determine its characteristics. In the medical field, instead of extracting material from a patient's body for testing, optical energy can be applied to human tissue so that transmitted or reflected energy can be measured to determine information about the material through which the energy has passed. This form of non-invasive measurement can be performed quickly and easily and has proven to be more comfortable to the patient.

Furthermore, non-invasive physiological monitoring of body functions is often required. For example, during surgery, the available supply of oxygen in the body, or the blood oxygen saturation, is often monitored. This measurement is sometimes performed by non-invasive techniques to enable medical determinations to be made by measuring the ratio of incident to transmitted (or reflected) light through a portion of the body such as, for example, a finger, an ear lobe, or the forehead. Transmission of optical energy as it passes through the body is strongly effected by the thickness of the material through which the energy passes, optical coupling, the optical angle, and the distance between the detector and the source of energy, collectively referred to as the optical path length.

Several parts of the human body are soft and compressible and ideally suited to transmit optical energy. For example, a human digit, such as the finger, comprises skin, muscle, tissue, bone, blood, etc. Although the bone is relatively incompressible, the tissue surrounding the bone is easily compressed when an external pressure is applied to the finger. However, if optical energy is applied to a finger and the patient moves or the finger is compressed in a manner which decouples the optical path between the optical source and detector, the optical path length correspondingly changes. Since a patient moves in an erratic fashion, the compression of the finger and the decoupling of the detector are also erratic. This causes the change in optical path length to be unpredictable and non-compensatable, making the absorption of optical energy erratic, thereby resulting in a noisy, difficult to interpret output signal.

Optical probes have been used in the past for both invasive and non-invasive applications. In the typical optical probe, a light emitting diode (LED) is placed on one side of the human tissue while a photodetector is placed on the opposite side. Such conventional optical probes are primarily useful when a patient is relatively motionless and in environments which are characterized by low ambient room light.

By way of particular example, one well known non-invasive measuring device in which an optical probe is used in health applications is the pulse oximeter which measures pulse rate and the percent of oxygen available in an arterial vessel. Up until the early 1980's, clinicians relied upon arterial blood gas analysis to evaluate gas exchange and oxygen transport within the human body. Although the arterial blood gas test gives valuable information, it only reflects a patient's oxygenation status for one moment in time. On the other hand, pulse oximetry permits a continuous, non-invasive measurement of a patient's arterial oxygen saturation status.

Oxygen saturation is defined as the amount of hemoglobin carried oxygen in relation to its total hemoglobin carrying capacity. Oxygen is carried by hemoglobin cells. A characteristic of hemoglobin is the different ways in which it absorbs both red and infrared light when carrying oxygen in the form of oxyhemoglobin relative to when it is not carrying oxygen in the form of reduced hemoglobin. Pulse oximetry takes advantage of this difference to determine arterial blood oxygen saturation.

An oximetric sensor commonly includes a photodetector and a pair of LEDs which emit both red and infrared light. The sensor is packaged in such a way that the LEDs and photodetector are placed on opposite sides of a vascular bed which, in the transillumination case, is usually a finger, ear lobe or toe. In the reflectance case, the LEDs and the photodetector are placed side by side, but separated by a barrier which blocks light from reaching the detector without first passing through the tissue sample. When properly positioned, the LEDs emit known wavelengths of both red and infrared light for transmission through the vascular bed for receipt by the detector.

As the photodetector receives unabsorbed light which passes through the vascular bed, a signal is produced. This signal is converted to digital form and then supplied to a computer or microprocessor which computes the ratio of red light to infrared light absorption. The absorption data is then utilized to determine the arterial blood oxygen saturation values which may then be displayed on a monitor or a strip chart. Since the light that is directed into the vascular bed is also at least partially absorbed by the nearby tissue and bone material, the oximeter utilizes the alternating bright and dim signals caused by arterial pulsations to further clarify the presence of both reduced hemoglobin and oxyhemoglobin.

By virtue of the foregoing, a health care provider is able to assess second to second changes in a patient's arterial oxygen saturation. This enables the possibility of intervention before hypoxemia occurs. Hypoxemia results from lack of oxygen in the blood which can lead to brain damage or even death. What is more, the health care provider is also able to evaluate the patient's response to treatment on a continuous basis.

Initially utilized in the operating room, pulse oximetry is becoming increasingly common in other parts of the hospital including emergency rooms, adult and neonatal intensive care units, and post anesthesia care units. It is expected that pulse oximeters will also find their way into the general ward and even outside the hospital by medical emergency technicians and private physicians. It is in these new areas that the prior art optical probes (i.e. sensors) have proven to be inadequate due to patient movement and their relatively noisy environment.

One conventional optical sensor that is adhesively attached to a patient's finger is disclosed in U.S. Pat. No. 4,830,014 issued May 16, 1989 to Goodman et al. In its non-applied configuration, this sensor has a plainer I-shape with adhesive covering an entire side. The area of the sensor which is intended to cover the radius of the finger is narrowed so as to provide less stability at the finger tip. This sensor is characterized by a very complex layered structure including a plurality of adhesive backed surfaces laid one atop the other. A first of said adhesive backed surfaces includes apertures through which a light source and optical detector communicate with one another. Another surface firmly engages the patient's finger so as to move therewith. In this sensor configuration, the light source must be precisely aligned with the apertures to insure that light will pass therethrough. As a consequence of the high degree of adhesive attachment between the sensor and the patient's finger, movement of the finger and the corresponding compression of the muscle tissue translates into tension, sudden optical decoupling, and compression of certain surfaces of the sensor.

The foregoing causes a shift in the light path length and a misalignment between the light source and detector. Further compression of the muscle tissue along one side of the finger with tension acting along the other side causes the light source to move relative to the detector along the entire length of the finger. This causes changes to the radiation angles and relocates the detector out of optimum alignment with respect to the light source.

Another known optical sensor is described in U.S. Pat. No. 5,125,403 issued Jun. 30, 1992 to Culp. A woven tube which is folded partially inside itself secures a side-folding light source and detector structure about a patient's finger tip. The finger engages the side-folding structure and pushes it inside the woven tube causing the tube to begin sliding inside out. However, the woven tube is unstable, tending to reverse its inside out movement. Moreover, the side-folding structure can slide off the tip of the finger thereby requiring that the entire assembly be refolded and refitted onto the finger. Flexing the finger can also cause disengagement, and the woven structure does not sufficiently act to straighten the finger after the finger has been flexed.

SUMMARY OF THE INVENTION

In general terms, a low noise, disposable oximetric sensor is disclosed comprising a finger cot probe that is non-adhesively attached to a human digit (e.g. a finger) so that the finger will remain essentially non-deformed during testing. This advantageously avoids the shortcomings associated with conventional optical sensors that are adhesively bonded to a finger and, as described above, are undesirably susceptible to a displacement and a decoupling of the optical source relative to the detector if the patient moves his finger. By virtue of the presently disclosed oximetric sensor, the optical path is preserved and the angular displacement of the detector relative to the sensor is reduced to a minimum.

According to a first embodiment of the finger cot probe, a compact finger cot is disclosed including a rolled proximal end and a cup-shaped distal end. The finger cot is manufactured from a sheer elastic material that is adapted to distribute any occlusive forces evenly along the finger when the probe is applied. The tip of the patient's finger is placed in the cup-shaped distal end of the finger cot, and the rolled proximal end is unrolled longitudinally over the finger. The distal end of the finger cot carries an optical source and an optical detector to be arranged at opposite sides of the patient's finger so that the finger may be transilluminated. The source and detector are recessed within respective cavities formed in the distal end to enable the patient's tissue to enter the cavities when the finger is compressed. By virtue of the foregoing, the optical coupling and path length between the source and detector will remain substantially undisturbed in the event that the patient's finger is moved during testing.

According to a second embodiment of the finger cot probe, a generally planar, flexible protective backing is provided which carries a finger cot at the approximate mid-point thereof. The finger cot is manufactured from a sheer elastic material and includes a rolled proximal end and a cup-shaped distal end. The proximal end is rolled up in a direction so as to lie inside the finger cot. The distal end of the finger cot is connected to the protective backing by means of a pin which extends therebetween. The backing also carries an optical source and an optical detector at opposite ends thereof so as to be spaced from the finger cot. The source and detector are recessed within respective cavities into which the patient's tissue may be received as a result of movement of the finger and the corresponding compression of the patient's tissue. The tip of the patient's finger is placed against the protective backing opposite the cup-shaped distal end of the finger cut, and the rolled proximal end is unrolled over the distal end, whereby the distal end is inverted. The proximal end of the finger cot continues to unroll longitudinally over the finger to force the opposite ends of the flexible protective backing against respective opposite sides of the finger where the optical source and optical detector will be arranged relative to one another to transilluminate the patient's finger.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-3 illustrate a conventional finger cot probe;

FIG. 4 is a front view of a finger cot probe according to a first embodiment of the present invention;

FIG. 5 is a side view of the finger cot probe taken along lines 5-5 of FIG. 4;

FIGS. 6 and 7 illustrate the steps by which the finger cot probe of the first embodiment is applied to a finger of a patient;

FIGS. 8 and 9 show the finger cot probe fully applied to the patient's finger;

FIG. 10 shows a modified form of the finger cot probe of FIG. 9;

FIG. 11 is a top view of a finger cot probe according to a second embodiment of the present invention;

FIG. 12 is a cross-section taken along lines 12-12 of FIG. 11;

FIGS. 13 and 14 illustrate the steps by which the finger cot probe of the second embodiment is applied to a finger of a patient; and

FIG. 15 shows the finger cot probe fully applied to the patient's finger.

DETAILED DESCRIPTION

FIGS. 1-3 of the drawings illustrate a known finger cot probe 1 that has been used to provide information concerning blood constituents of a patient. The prior art finger cot probe 1 includes a flat protective backing 2 (best shown in FIG. 1) which carries a removable retaining bandage 4 (best shown in FIG. 2) that is adhesively bonded thereto. Extending longitudinally down the middle of the retaining bandage 4 is a relatively thin adhesive hold down surface 6. A flexible web 8 is retained against the hold down surface 6. The web 8 contains a pair of axially spaced openings 9 and 10 formed therethrough. Each of the openings 9 and 10 is preferably covered by a clear, transparent (e.g. thin plastic) material.

The retaining bandage 4 carries an optical source 12 and an optical detector 14. The optical source 12 is typically a pair of light emitting diodes (LEDs). The optical source 12 and the detector 14 are bonded to bandage 4 at the hold down surface 6 thereof so as to be received within the openings 9 and 10 of web 8 when the web is secured against the hold down surface 6. A wire is attached to each of the LEDs of the optical source 12 and to the optical detector 14. The wires are surrounded by an outer protective casing 16 that terminates at a conventional plug 18. The plug 18 is adapted to be interconnected with a controller (not shown) that supplies and receives signals to and from the optical source and detector 12 and 14.

The face of the retaining bandage 4 is covered with adhesive to permit the bandage to be removably attached to a human finger 20. That is, and as is best shown in FIG. 3, the bandage 4 is tightly wrapped around a patient's finger 20 so that the optical source 12 and optical detector 14 are aligned with one another at opposite sides of the finger 20. In this manner, the optical detector can receive optical signals transmitted through the patient's finger 20 by the LEDs of the optical source 12. After the information is gathered, the retaining bandage 4 is removed from finger 20 and discarded.

Because it is tightly affixed around the patient's finger 20, the adhesively backed retaining bandage 4 is unforgiving in the event that the patient moves his finger during testing. That is to say, and as has been described above, the finger is held in a state of compression, such that any movement during testing tends to decouple the optical source and detector and thereby causes the optical path length to vary. Thus, the signal derived from the finger cot probe of FIGS. 1-3 is often erratic and unreliable.

FIGS. 4-10 of the drawings illustrate one embodiment of the present invention for a disposable, self-adhering finger cot probe that overcomes the unreliability associated with the finger cot probe of FIGS. 1-3. As will soon be explained, the new finger cot probe comprises a compact finger cot 22 that can be quickly and easily attached to and removed from a patient's finger or other digit without the need for or inconvenience associated with a binding and uncomfortable to remove adhesive, such as that common to the conventional finger cot probe of FIGS. 1-3.

In the as-packaged configuration, the finger cot 22 includes an open proximal end 24 that is rolled up upon itself and a closed distal end 26. It is preferable that finger cot 22 be formed from a thin elastic Sheath that is opaque to ambient light. The closed distal end 24 of finger cot 22 is cup-shaped in which to receive the tip of the patient's finger 28. With the finger 28 located at the cup-shaped distal end 26 (best illustrated in FIG. 7), the rolled proximal end 24 is pulled rearwardly and unrolled longitudinally over finger 28, so as to form a generally tubular sleeve by which to surround enough of the finger to form a relatively close fit without generating occlusive pressure which may undesirably lead to tissue thrombosis. That is to say, the elastic sheath will distribute any compressive forces produced by the finger cot 22 evenly along the patient's finger 28. Moreover, the finger cot 22 is quickly and easily attached to finger 28 without the requirement or need for any adhesives or other uncomfortable securing means. Mence, the finger cot 22 may also be easily removed from the finger 28 and discarded at the conclusion of the testing process. The size (e.g. volume) of the finger cot 22 can vary from one probe to another depending upon the age and maturity of the patient.

For the purpose of maximizing comfort, a series of optional holes 30 are formed through the sheathing material which forms the finger cot 22 so as to increase air flow to the finger 28 (best illustrated in FIG. 8). When the proximal end 28 is pulled rearwardly so as to be fully unrolled along the patient's finger 28, the finger cot 22 will terminate at a relatively thick peripheral cuff 32 (also best illustrated in FIG. 8) which applies sufficient pressure to enhance the self-attachment of finger cot 22 to the finger 28 without adhesive or other securing means.

Referring particularly now to FIG. 9, there is shown in the applied, fully unrolled condition of finger cot 22 an optical source 34 and an optical detector 36 arranged in spaced optical alignment with one another at the distal end 26 to transilluminate the patient's finger 28 from opposite sides thereof. By way of example, the optical source 34 is preferably a pair of light emitting diodes (LEDs), only one of which being shown. Both the optical source and detector 34 and 36 are recessed within respective cavities 38 and 40, such that any tissue from the patient's finger 28 which enters the cavities 38 or 40 will be spaced from and out of contact with the optical source and detector 38 and 40. By virtue of the foregoing, the patient's tissue, when compressed, may be received within either cavity 38 and/or cavity 40 without substantial alteration of the optical coupling or path length between the source 34 and detector 36 in the event that the patient's finger is moved during that time when information is gathered. The cavities 38 and 40 may be filled with an optional viscous coupling medium, such as an oil or gel having an index of refraction which corresponds to that of the patient's skin.

A pair of electrically conductive wires 41 and 42 are connected to the LEDs which form optical source 34. Another electrically conductive wire 44 is connected to the optical detector 36. The wires 41, 42 and 44 from the optical source and detector 34 and 36 extend longitudinally through the proximal end 24 of the finger cot 22 to be aligned side-by-side one another and surrounded by an electrically insulating outer protective casing or sleeve 46 (best shown in FIG. 8) as the wires exit the finger cot 22. Outer sleeve 46 carries the wires 41, 42 and 44 to suitable controller and signal processing means (not shown) which will be briefly described hereinafter.

FIG. 10 of the drawings shows a finger cot 22-1 that is a modified form of the finger cot 22 illustrated in FIGS. 4-9. That is to say, while the proximal and distal ends 24 and 26 of the finger cot 22 are of uniform thickness, the distal end 26-1 of modified finger cot 22-1 is thicker than the proximal end 24-1 thereof. This variation in thickness has been found to make the modified finger cot 22-1 easier to roll into the compact, as-packaged configuration of FIGS. 4 and 5.

FIGS. 11-15 of the drawings show a finger cot probe 50 according to a second embodiment of the present invention. The probe 50 includes a generally planar protective backing or carrier 52 which is preferably formed from a flexible (e.g. plastic) material. Carried at the approximate midpoint of the protective backing 52 of probe 50 is a finger cot 54 manufactured from a thin, elastic sheath that is opaque to ambient light. Like the finger cot 22 described when referring earlier to FIGS. 4 and 5, the finger cot 54, in the as-packaged configuration, includes an open proximal end 56 that is rolled up upon itself and a closed, cupshaped distal end 58. However, the proximal end 56 is rolled up so as to lie inside the finger cot 54 (represented by phantom lines in FIGS. 12 and 13).

The finger cot 54 is attached to the protective backing 52 by means of a pin 60. The pin 60 has a narrow body, a relatively wide pin head 62 at one end of the body and a pair of flexible legs or ties 64 at the opposite end. The pin 60 extends through both the protective backing 52 of finger cot probe 50 and the distal end 58 of finger cot 54, such that the pin head 62 connects the finger cot 54 at one side of the backing 52 with the flexible legs 64 projecting outwardly from the opposite side. The legs 64 are bent downwardly towards and secured (e.g. sewn) to the backing 52 for reliably securing the finger cot 54 to the backing. In this position, the legs 64 provide the advantage of a target towards which the patient's finger is aimed when the finger cot 54 is applied (best shown in FIG. 13).

While the optical source 34 and detector 36 of the finger cot probe of FIGS. 4-10 were included as an integral part of the finger cot 22, the finger cot probe 50 of the present embodiment includes an optical source 66 and an optical detector 68 (e.g. a pair of LEDs) which are separated from the finger cot 54. More particularly, the optical source and detector 66 and 68 are retained at opposite ends of the protective backing 52 of probe 50 and spaced from the finger cot 54. The optical source and detector 66 and 68 are recessed within respective cavities 70 and 72 so that the patient's tissue may be received therein without contacting either the source or detector to preserve the optical coupling and path length therebetween in the event that the patient's finger is moved and the tissue compressed during testing.

To facilitate the formation of the cavities 70 and 72, the protective backing 52 of probe 50 may be formed by top and bottom layers 52-1 and 52-2 of flexible material (best shown in FIG. 12). The optical source and detector 66 and 68 are carried by the bottom layer 52-2 while the cavities 70 and 72 are formed through the top layer 52-1 in axial alignment with the source and detector. Moreover, the electrically conductive wires (best shown in FIG. 15) that are connected from the source and detector 66 and 68 to controller and signal processing means (not shown) may extend through the finger cot probe 50 at the interface between the top and bottom layers 52-1 and 52-2 of protective backing 52. In this regard, an electrically insulating outer protective casing or sleeve 78 (also best shown in FIG. 15) surrounds the wires as they exit the probe 50.

FIGS. 13-15 illustrate the steps for applying the finger cot probe 50 to a patient's finger 74 from the as-packaged rolled configuration of the finger cot 54 (best shown in FIG. 13) to the fully unrolled configuration (best shown in FIG. 15). The patient's finger 74 is first placed on the target formed at the intersection of the flexible legs 64 of the pin 60 opposite the unrolled distal end of finger cot 54. To this end, a small amount of adhesive may be applied to the legs 64 merely to hold the finger 74 against the target during application of the finger cot 54. The unrolled proximal end 56 of finger cot 54 is then pulled rearwardly towards finger 74 and unrolled over the cup-shaped distal end 58 of the finger cot, whereby the distal end is inverted and the patient's finger is surrounded thereby. The continued rearward movement of the proximal end 56 over the protective backing 52 so as to form a generally tubular sleeve also forces the opposite ends of the backing towards one another and against respective opposite sides of the finger 74.

In the fully unrolled and applied condition of the finger cot probe 50, the protective backing 52 is bent and retained around the finger 74, such that the optical source and optical detector 66 and 68 are held in spaced optical alignment with one another at opposite sides of the finger 74 so that the finger may be transilluminated. The fully unrolled finger cot 54 terminates at a relatively thick peripheral cuff 76 (best shown in FIG. 15) which applies sufficient pressure to attach the finger cot 54 to the finger 74 without hard to remove or uncomfortable adhesive or other retaining means.

The optical detectors described with regard to the finger cot probes 22 and 50 which form this invention are responsive to light absorption from the transillumination of the patient's muscle tissue. More particularly, the output signals provided by the detector can be digitally encoded and then processed for the purpose of enabling health care providers to analyze the patient's blood by non-invasively calculating the concentration of blood constituents. For example, the output signals derived from the optical detectors can be used to provide a reliable indication of the saturation of oxygen within the patient's blood. The foregoing may be accomplished by means of a pulse oximeter which receives from the optical detector two output signals having different wavelengths, one of which is typically red and the other of which is typically infrared. The two signals are alternately passed through the patient's finger by the optical source. The signals are measured at the optical detector and are then processed to determine the amount of oxygen available to the body. This information is evaluated to derive the saturation of oxygenated hemoglobin in the blood comprising both oxygenated and deoxygenated hemoglobin.

One pulse oximeter which is especially suitable for use herein with finger cot probes 22 and 50 is that described in co-pending U.S. patent application Ser. No. 672,890 filed Mar. 21, 1991 and assigned to the assignee of this patent application. Therefore, the teachings of patent application Ser. No. 672,890 relating to pulse oximetry are incorporated herein by reference. However, it is to be understood that this oximeter is given for purposes of example only, and the particular pulse oximeter selected for processing the output signals from the optical detectors forms no part of the claimed invention.

It will be apparent that while a preferred embodiment of the invention has been shown and described, various modifications and changes may be made without departing from the true spirit and scope of the invention. For example, although the finger cot probes herein have been described as having particular use with a patient's finger, it is to be expressly understood that the teachings of this invention are also applicable to any other human digit or suitable palpable tissue area. What is more, while the optical detectors herein have been described as being responsive to the transillumination of human tissue, it is also to be understood that the optical detectors may be suitably located to be responsive to transreflectance, as well.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2567926 *Mar 1, 1946Sep 18, 1951Dunkelberger Milton STubular supporting member
US4334544 *Apr 28, 1980Jun 15, 1982Amf IncorporatedEar lobe clip with heart beat sensor
US4621643 *Feb 5, 1986Nov 11, 1986Nellcor IncorporatedCalibrated optical oximeter probe
US4830014 *Jul 7, 1987May 16, 1989Nellcor IncorporatedSensor having cutaneous conformance
US4867165 *Aug 13, 1987Sep 19, 1989Hewlett-Packard CompanyMethod for determining the perfusion
US4907594 *Jun 22, 1988Mar 13, 1990Nicolay GmbhMethod for the determination of the saturation of the blood of a living organism with oxygen and electronic circuit for performing this method
US5031608 *Jun 3, 1987Jul 16, 1991Weinstein David JProtective guard aid device designed for injured and wounded fingers and/or toes
US5125403 *Feb 20, 1991Jun 30, 1992Culp Joel BDevice and method for engagement of an oximeter probe
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5452717 *Jun 2, 1994Sep 26, 1995Masimo CorporationFor analyzing at least one characteristic of tissue
US5507286 *Dec 23, 1993Apr 16, 1996Medical Taping Systems, Inc.Method and apparatus for improving the durability of a sensor
US5776059 *Oct 10, 1996Jul 7, 1998Hewlett-Packard CompanySensor for performing medical measurements, particularly pulsoximetry measurements on the human finger
US5782757 *Oct 16, 1995Jul 21, 1998Masimo CorporationFor non-invasive measurement of characteristics of a medium
US5817010 *Mar 25, 1997Oct 6, 1998Ohmeda Inc.Disposable sensor holder
US5830136 *Oct 31, 1996Nov 3, 1998Nellcor Puritan Bennett IncorporatedGel pad optical sensor
US5842982 *Aug 7, 1996Dec 1, 1998Nellcor Puritan Bennett IncorporatedInfant neonatal pulse oximeter sensor
US5891026 *Jan 29, 1996Apr 6, 1999Ntc Technology Inc.Extended life disposable pulse oximetry sensor and method of making
US5978691 *Jul 10, 1997Nov 2, 1999Mills; Alexander KnightDevice and method for noninvasive continuous determination of blood gases, pH, hemoglobin level, and oxygen content
US5986446 *Feb 5, 1997Nov 16, 1999C. Blake WilliamsonMulti-meter and probe assembly and method of use
US5999834 *Jun 18, 1998Dec 7, 1999Ntc Technology, Inc.Disposable adhesive wrap for use with reusable pulse oximetry sensor and method of making
US6026312 *Jun 23, 1997Feb 15, 2000Respironics, Inc.Method and apparatus for diode laser pulse oximetry using fiber optical cables
US6061584 *Oct 28, 1998May 9, 2000Lovejoy; David A.Pulse oximetry sensor
US6073038 *Oct 23, 1998Jun 6, 2000Ntc Technologies, Inc.Extended life disposable pulse oximetry sensor
US6084676 *Oct 29, 1998Jul 4, 2000Kyoto Dai-Ichi Kagaku Co., Ltd.Non-contact non-invasive measuring method and apparatus
US6088607 *Jan 28, 1997Jul 11, 2000Masimo CorporationLow noise optical probe
US6094592 *May 26, 1998Jul 25, 2000Nellcor Puritan Bennett, Inc.Methods and apparatus for estimating a physiological parameter using transforms
US6149481 *Oct 23, 1998Nov 21, 2000Ntc Technology, Inc.Extended life disposable pulse oximetry sensor and method of making
US6253098 *Sep 3, 1999Jun 26, 2001The United States Of America As Represented By The Secretary Of The ArmyDisposable pulse oximeter assembly and protective cover therefor
US6256523Jun 9, 1998Jul 3, 2001Masimo CorporationLow-noise optical probes
US6263223Sep 3, 1999Jul 17, 2001The United States Of America As Represented By The Secretary Of The ArmyMethod for monitoring arterial oxygen saturation
US6319205Jul 23, 1997Nov 20, 2001Itamar Medical (C.M.) 1997 Ltd.Method and apparatus for the non-invasive detection of medical conditions by monitoring peripheral arterial tone
US6322515Jun 2, 1999Nov 27, 2001Itamar MedicalMethod and apparatus for the non-invasive detection of medical conditions by monitoring peripheral arterial tone
US6461305Jun 2, 1999Oct 8, 2002Itamar MedicalPressure applicator devices particularly useful for non-invasive detection of medical conditions
US6470200Feb 12, 2001Oct 22, 2002The United States Of America As Represented By The Secretary Of The ArmyPacifier pulse oximeter sensor
US6487439 *Mar 17, 1997Nov 26, 2002Victor N. SkladnevGlove-mounted hybrid probe for tissue type recognition
US6488633Feb 8, 2000Dec 3, 2002Itamar Medical (C.M.) Ltd.Probe devices particularly useful for non-invasive detection of medical conditions
US6541756Jan 25, 2001Apr 1, 2003Masimo CorporationShielded optical probe having an electrical connector
US6654622Dec 1, 1999Nov 25, 2003Linde Medical Sensors AgDevice for the combined measurement of the arterial oxygen saturation and the transcutaneous CO2 partial pressure on an ear lobe
US6671532Sep 13, 2002Dec 30, 2003Respironics Novametrix, Inc.Pulse oximetry sensor and dispensing method
US6694157Feb 9, 1999Feb 17, 2004Daedalus I , L.L.C.Method and apparatus for determination of pH pCO2, hemoglobin, and hemoglobin oxygen saturation
US6721585Aug 17, 2001Apr 13, 2004Sensidyne, Inc.Universal modular pulse oximeter probe for use with reusable and disposable patient attachment devices
US6731963 *Sep 7, 2001May 4, 2004Orsense Ltd.Device for enhancement and quality improvement of blood-related signals for use in a system for non-invasive measurements of blood-related signals
US6763256Aug 16, 2002Jul 13, 2004Optical Sensors, Inc.Pulse oximeter
US6792300Jul 3, 2001Sep 14, 2004Masimo CorporationLow-noise optical probes for reducing light piping
US6813511Sep 27, 2002Nov 2, 2004Masimo CorporationLow-noise optical probes for reducing ambient noise
US6816741Oct 8, 2002Nov 9, 2004Masimo CorporationPlethysmograph pulse recognition processor
US6822564Jan 24, 2003Nov 23, 2004Masimo CorporationParallel measurement alarm processor
US6850787Jun 26, 2002Feb 1, 2005Masimo Laboratories, Inc.Signal component processor
US6850788Feb 28, 2003Feb 1, 2005Masimo CorporationPhysiological measurement communications adapter
US6861639Feb 3, 2003Mar 1, 2005Masimo CorporationSystems and methods for indicating an amount of use of a sensor
US6879850Aug 16, 2002Apr 12, 2005Optical Sensors IncorporatedPulse oximeter with motion detection
US6916289May 24, 2004Jul 12, 2005Itamar Medical Ltd.Pressure applicator devices particularly useful for non-invasive detection of medical conditions
US6920345Jan 24, 2003Jul 19, 2005Masimo CorporationOptical sensor including disposable and reusable elements
US6923762 *Oct 22, 2002Aug 2, 2005Frank C. Creaghan, Jr.Venoscope apparatus
US6934570Dec 19, 2002Aug 23, 2005Masimo CorporationPhysiological sensor combination
US6941162Dec 29, 2003Sep 6, 2005Respironics Novametrix, Inc.Pulse oximetry sensor and dispensing method
US6950687Jan 24, 2003Sep 27, 2005Masimo CorporationIsolation and communication element for a resposable pulse oximetry sensor
US6961598Feb 21, 2003Nov 1, 2005Masimo CorporationPulse and active pulse spectraphotometry
US6970792Dec 3, 2003Nov 29, 2005Masimo Laboratories, Inc.Systems and methods for determining blood oxygen saturation values using complex number encoding
US6979812Feb 24, 2005Dec 27, 2005Masimo CorporationSystems and methods for indicating an amount of use of a sensor
US6985764May 2, 2002Jan 10, 2006Masimo CorporationFlex circuit shielded optical sensor
US6996427Dec 18, 2003Feb 7, 2006Masimo CorporationPulse oximetry data confidence indicator
US6999904Aug 5, 2002Feb 14, 2006Masimo CorporationVariable indication estimator
US7003338Jul 8, 2003Feb 21, 2006Masimo CorporationMethod and apparatus for reducing coupling between signals
US7024233Sep 16, 2004Apr 4, 2006Masimo CorporationPulse oximetry data confidence indicator
US7027849Nov 21, 2003Apr 11, 2006Masimo Laboratories, Inc.Blood parameter measurement system
US7030749Oct 28, 2004Apr 18, 2006Masimo CorporationParallel measurement alarm processor
US7039449Dec 19, 2003May 2, 2006Masimo CorporationResposable pulse oximetry sensor
US7041060Sep 6, 2005May 9, 2006Masimo CorporationRapid non-invasive blood pressure measuring device
US7044918Oct 27, 2004May 16, 2006Masimo CorporationPlethysmograph pulse recognition processor
US7096052Oct 6, 2003Aug 22, 2006Masimo CorporationOptical probe including predetermined emission wavelength based on patient type
US7096054Jul 31, 2003Aug 22, 2006Masimo CorporationLow noise optical housing
US7132641Mar 31, 2003Nov 7, 2006Masimo CorporationShielded optical probe having an electrical connector
US7142901Nov 14, 2003Nov 28, 2006Masimo CorporationParameter compensated physiological monitor
US7149561Oct 28, 2003Dec 12, 2006Masimo CorporationOptical spectroscopy pathlength measurement system
US7171251 *Mar 18, 2003Jan 30, 2007Spo Medical Equipment Ltd.Physiological stress detector device and system
US7186966Dec 19, 2005Mar 6, 2007Masimo CorporationAmount of use tracking device and method for medical product
US7190261Apr 18, 2006Mar 13, 2007Masimo CorporationArrhythmia alarm processor
US7215984May 4, 2004May 8, 2007Masimo CorporationSignal processing apparatus
US7215986Jun 15, 2005May 8, 2007Masimo CorporationSignal processing apparatus
US7225006Jan 23, 2003May 29, 2007Masimo CorporationAttachment and optical probe
US7225007Jun 30, 2005May 29, 2007Masimo CorporationOptical sensor including disposable and reusable elements
US7239905Aug 16, 2005Jul 3, 2007Masimo Laboratories, Inc.Active pulse blood constituent monitoring
US7245953Nov 5, 2002Jul 17, 2007Masimo CorporationReusable pulse oximeter probe and disposable bandage apparatii
US7254431Aug 30, 2004Aug 7, 2007Masimo CorporationPhysiological parameter tracking system
US7254434Oct 13, 2004Aug 7, 2007Masimo CorporationVariable pressure reusable sensor
US7272425Sep 26, 2005Sep 18, 2007Masimo CorporationPulse oximetry sensor including stored sensor data
US7274955Sep 25, 2003Sep 25, 2007Masimo CorporationParameter compensated pulse oximeter
US7280858Jan 4, 2005Oct 9, 2007Masimo CorporationPulse oximetry sensor
US7292883Mar 30, 2005Nov 6, 2007Masimo CorporationPhysiological assessment system
US7295866Feb 24, 2004Nov 13, 2007Masimo CorporationLow power pulse oximeter
US7321790Sep 29, 2006Jan 22, 2008Nellcor Puritan Bennett IncorporatedShunt barrier in pulse oximeter sensor
US7328053Nov 17, 1998Feb 5, 2008Masimo CorporationSignal processing apparatus
US7332784Jun 27, 2006Feb 19, 2008Masimo CorporationMethod of providing an optoelectronic element with a non-protruding lens
US7340287Dec 2, 2005Mar 4, 2008Masimo CorporationFlex circuit shielded optical sensor
US7343186May 27, 2005Mar 11, 2008Masimo Laboratories, Inc.Multi-wavelength physiological monitor
US7355512Mar 13, 2007Apr 8, 2008Masimo CorporationParallel alarm processor
US7359742Nov 12, 2004Apr 15, 2008Nonin Medical, Inc.Sensor assembly
US7369886Sep 28, 2006May 6, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7371981Feb 18, 2005May 13, 2008Masimo CorporationConnector switch
US7373188 *Sep 25, 2006May 13, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7373189Sep 25, 2006May 13, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7373190Sep 28, 2006May 13, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7373191Sep 29, 2006May 13, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7373193Nov 5, 2004May 13, 2008Masimo CorporationPulse oximetry data capture system
US7373194Feb 1, 2005May 13, 2008Masimo CorporationSignal component processor
US7374540 *Mar 26, 2002May 20, 2008Itamar Medical Ltd.Non-invasive probe for detecting medical conditions
US7377794Mar 1, 2006May 27, 2008Masimo CorporationMultiple wavelength sensor interconnect
US7377899May 3, 2006May 27, 2008Masimo CorporationSine saturation transform
US7386334Sep 25, 2006Jun 10, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7389130Sep 25, 2006Jun 17, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7392074Jan 21, 2005Jun 24, 2008Nonin Medical, Inc.Sensor system with memory and method of using same
US7415297Mar 8, 2005Aug 19, 2008Masimo CorporationPhysiological parameter system
US7418284Sep 28, 2006Aug 26, 2008Nellcor Puritan Bennett Inc.Shunt barrier in pulse oximeter sensor
US7428432Apr 22, 2003Sep 23, 2008Masimo CorporationSystems and methods for acquiring calibration data usable in a pulse oximeter
US7438683Mar 3, 2005Oct 21, 2008Masimo CorporationApplication identification sensor
US7440787Nov 28, 2005Oct 21, 2008Masimo Laboratories, Inc.Systems and methods for determining blood oxygen saturation values using complex number encoding
US7454240May 11, 2006Nov 18, 2008Masimo CorporationSignal processing apparatus
US7467002Aug 20, 2007Dec 16, 2008Masimo CorporationSine saturation transform
US7471969Nov 25, 2003Dec 30, 2008Masimo CorporationPulse oximeter probe-off detector
US7471971Mar 2, 2004Dec 30, 2008Masimo CorporationSignal processing apparatus and method
US7483729Nov 4, 2004Jan 27, 2009Masimo CorporationPulse oximeter access apparatus and method
US7483730Oct 4, 2004Jan 27, 2009Masimo CorporationLow-noise optical probes for reducing ambient noise
US7489958May 3, 2006Feb 10, 2009Masimo CorporationSignal processing apparatus and method
US7496391Jan 13, 2004Feb 24, 2009Masimo CorporationManual and automatic probe calibration
US7499741May 4, 2004Mar 3, 2009Masimo CorporationSignal processing apparatus and method
US7499835Mar 14, 2006Mar 3, 2009Masimo CorporationVariable indication estimator
US7500950Jul 23, 2004Mar 10, 2009Masimo CorporationMultipurpose sensor port
US7509154Aug 20, 2007Mar 24, 2009Masimo CorporationSignal processing apparatus
US7509494Feb 28, 2003Mar 24, 2009Masimo CorporationInterface cable
US7526328Dec 15, 2006Apr 28, 2009Masimo CorporationManual and automatic probe calibration
US7530942Oct 18, 2006May 12, 2009Masimo CorporationRemote sensing infant warmer
US7530949Aug 3, 2004May 12, 2009Masimo CorporationDual-mode pulse oximeter
US7530955May 4, 2004May 12, 2009Masimo CorporationSignal processing apparatus
US7561905Sep 29, 2006Jul 14, 2009Nellcor Puritan Bennet LLCShunt barrier in pulse oximeter sensor
US7563110May 23, 2008Jul 21, 2009Masimo Laboratories, Inc.Multiple wavelength sensor interconnect
US7596398Mar 1, 2006Sep 29, 2009Masimo Laboratories, Inc.Multiple wavelength sensor attachment
US7618375Apr 28, 2006Nov 17, 2009Masimo CorporationRapid non-invasive blood pressure measuring device
US7628760Dec 11, 2007Dec 8, 2009Semler Scientific, Inc.Circulation monitoring system and method
US7647083Mar 1, 2006Jan 12, 2010Masimo Laboratories, Inc.Multiple wavelength sensor equalization
US7662106Oct 15, 2002Feb 16, 2010Ric Investments, Llc.Respiratory profile parameter determination apparatus
US7698909Feb 13, 2004Apr 20, 2010Nellcor Puritan Bennett LlcHeadband with tension indicator
US7729733Mar 1, 2006Jun 1, 2010Masimo Laboratories, Inc.Configurable physiological measurement system
US7734320Aug 20, 2007Jun 8, 2010Masimo CorporationSensor isolation
US7761127Mar 1, 2006Jul 20, 2010Masimo Laboratories, Inc.Multiple wavelength sensor substrate
US7761128Apr 13, 2005Jul 20, 2010Masimo CorporationPhysiological monitor
US7764982Mar 1, 2006Jul 27, 2010Masimo Laboratories, Inc.Multiple wavelength sensor emitters
US7791155Dec 21, 2007Sep 7, 2010Masimo Laboratories, Inc.Detector shield
US7801581Dec 11, 2006Sep 21, 2010Masimo Laboratories, Inc.Optical spectroscopy pathlength measurement system
US7806831Jul 16, 2002Oct 5, 2010Itamar Medical Ltd.Method and apparatus for the non-invasive detection of particular sleep-state conditions by monitoring the peripheral vascular system
US7809420Jul 26, 2006Oct 5, 2010Nellcor Puritan Bennett LlcHat-based oximeter sensor
US7810359Oct 1, 2003Oct 12, 2010Nellcor Puritan Bennett LlcHeadband with tension indicator
US7813779Jul 26, 2006Oct 12, 2010Nellcor Puritan Bennett LlcHat-based oximeter sensor
US7822452Apr 13, 2006Oct 26, 2010Glt Acquisition Corp.Method for data reduction and calibration of an OCT-based blood glucose monitor
US7822453Jul 28, 2006Oct 26, 2010Nellcor Puritan Bennett LlcForehead sensor placement
US7844314Feb 1, 2005Nov 30, 2010Masimo CorporationPhysiological measurement communications adapter
US7844315May 3, 2006Nov 30, 2010Masimo CorporationPhysiological measurement communications adapter
US7865222Jan 23, 2006Jan 4, 2011Masimo LaboratoriesMethod and apparatus for reducing coupling between signals in a measurement system
US7873497Jan 29, 2009Jan 18, 2011Masimo CorporationVariable indication estimator
US7877126Jul 26, 2006Jan 25, 2011Nellcor Puritan Bennett LlcHat-based oximeter sensor
US7877127Jul 26, 2006Jan 25, 2011Nellcor Puritan Bennett LlcHat-based oximeter sensor
US7880606Feb 12, 2008Feb 1, 2011Masimo CorporationPhysiological trend monitor
US7880626Oct 12, 2006Feb 1, 2011Masimo CorporationSystem and method for monitoring the life of a physiological sensor
US7891355May 3, 2006Feb 22, 2011Masimo CorporationPhysiological monitor
US7894868May 5, 2006Feb 22, 2011Masimo CorporationPhysiological monitor
US7899507May 3, 2006Mar 1, 2011Masimo CorporationPhysiological monitor
US7899509Jul 28, 2006Mar 1, 2011Nellcor Puritan Bennett LlcForehead sensor placement
US7904132Dec 16, 2008Mar 8, 2011Masimo CorporationSine saturation transform
US7910875Mar 6, 2007Mar 22, 2011Masimo CorporationSystems and methods for indicating an amount of use of a sensor
US7919713Apr 16, 2008Apr 5, 2011Masimo CorporationLow noise oximetry cable including conductive cords
US7937128Jun 30, 2005May 3, 2011Masimo CorporationCyanotic infant sensor
US7937129Mar 21, 2006May 3, 2011Masimo CorporationVariable aperture sensor
US7937130Dec 19, 2008May 3, 2011Masimo CorporationSignal processing apparatus
US7941199May 15, 2007May 10, 2011Masimo Laboratories, Inc.Sepsis monitor
US7951086Nov 12, 2009May 31, 2011Masimo CorporationRapid non-invasive blood pressure measuring device
US7957780Mar 1, 2006Jun 7, 2011Masimo Laboratories, Inc.Physiological parameter confidence measure
US7962188Oct 12, 2006Jun 14, 2011Masimo CorporationRobust alarm system
US7962190Jul 7, 1998Jun 14, 2011Masimo CorporationSignal processing apparatus
US7976472Sep 6, 2005Jul 12, 2011Masimo CorporationNoninvasive hypovolemia monitor
US7979102Feb 21, 2006Jul 12, 2011Nellcor Puritan Bennett LlcHat-based oximeter sensor
US7988637May 3, 2006Aug 2, 2011Masimo CorporationPlethysmograph pulse recognition processor
US7990382Jan 3, 2007Aug 2, 2011Masimo CorporationVirtual display
US7991446May 8, 2006Aug 2, 2011Masimo CorporationSystems and methods for acquiring calibration data usable in a pulse oximeter
US8000761May 2, 2006Aug 16, 2011Masimo CorporationResposable pulse oximetry sensor
US8019400Aug 20, 2007Sep 13, 2011Masimo CorporationSignal processing apparatus
US8028701May 31, 2007Oct 4, 2011Masimo CorporationRespiratory monitoring
US8036727Jun 2, 2006Oct 11, 2011Glt Acquisition Corp.Methods for noninvasively measuring analyte levels in a subject
US8036728Jun 21, 2007Oct 11, 2011Masimo CorporationSignal processing apparatus
US8046040Apr 4, 2006Oct 25, 2011Masimo CorporationPulse oximetry data confidence indicator
US8046041Jun 21, 2007Oct 25, 2011Masimo CorporationSignal processing apparatus
US8046042Jun 21, 2007Oct 25, 2011Masimo CorporationSignal processing apparatus
US8048040Sep 11, 2008Nov 1, 2011Masimo CorporationFluid titration system
US8050728Mar 1, 2006Nov 1, 2011Masimo Laboratories, Inc.Multiple wavelength sensor drivers
US8118620Oct 9, 2008Feb 21, 2012Masimo CorporationConnector assembly with reduced unshielded area
US8126528Mar 24, 2009Feb 28, 2012Masimo CorporationSignal processing apparatus
US8128572Nov 24, 2008Mar 6, 2012Masimo CorporationSignal processing apparatus
US8130105Mar 1, 2006Mar 6, 2012Masimo Laboratories, Inc.Noninvasive multi-parameter patient monitor
US8145287Apr 24, 2009Mar 27, 2012Masimo CorporationManual and automatic probe calibration
US8175672Jul 6, 2007May 8, 2012Masimo CorporationReusable pulse oximeter probe and disposable bandage apparatii
US8180420Aug 20, 2007May 15, 2012Masimo CorporationSignal processing apparatus and method
US8182443Jan 17, 2007May 22, 2012Masimo CorporationDrug administration controller
US8190223Mar 1, 2006May 29, 2012Masimo Laboratories, Inc.Noninvasive multi-parameter patient monitor
US8190227Feb 9, 2009May 29, 2012Masimo CorporationSignal processing apparatus and method
US8203438Jul 28, 2009Jun 19, 2012Masimo CorporationAlarm suspend system
US8203704Aug 3, 2009Jun 19, 2012Cercacor Laboratories, Inc.Multi-stream sensor for noninvasive measurement of blood constituents
US8204566Aug 2, 2007Jun 19, 2012Glt Acquisition Corp.Method and apparatus for monitoring blood constituent levels in biological tissue
US8219172Mar 17, 2006Jul 10, 2012Glt Acquisition Corp.System and method for creating a stable optical interface
US8224411Mar 1, 2006Jul 17, 2012Masimo Laboratories, Inc.Noninvasive multi-parameter patient monitor
US8228181Jan 31, 2011Jul 24, 2012Masimo CorporationPhysiological trend monitor
US8229533Jan 25, 2012Jul 24, 2012Masimo CorporationLow-noise optical probes for reducing ambient noise
US8233955Nov 29, 2006Jul 31, 2012Cercacor Laboratories, Inc.Optical sensor including disposable and reusable elements
US8244325May 29, 2007Aug 14, 2012Cercacor Laboratories, Inc.Noninvasive oximetry optical sensor including disposable and reusable elements
US8251914Dec 23, 2009Aug 28, 2012Ric Investments, LlcRespiratory profile parameter determination method and apparatus
US8255026Oct 12, 2007Aug 28, 2012Masimo Corporation, Inc.Patient monitor capable of monitoring the quality of attached probes and accessories
US8255027Jul 19, 2010Aug 28, 2012Cercacor Laboratories, Inc.Multiple wavelength sensor substrate
US8255028May 5, 2006Aug 28, 2012Masimo Corporation, Inc.Physiological monitor
US8257274Sep 25, 2008Sep 4, 2012Nellcor Puritan Bennett LlcMedical sensor and technique for using the same
US8260577Jan 14, 2011Sep 4, 2012Masimo CorporationVariable indication estimator
US8261938Aug 4, 2009Sep 11, 2012Oradini Sr Michael EFinger covers and devices for dispensing finger covers
US8265723Oct 12, 2007Sep 11, 2012Cercacor Laboratories, Inc.Oximeter probe off indicator defining probe off space
US8274360Oct 10, 2008Sep 25, 2012Masimo CorporationSystems and methods for storing, analyzing, and retrieving medical data
US8280473Oct 12, 2007Oct 2, 2012Masino Corporation, Inc.Perfusion index smoother
US8301217Sep 28, 2009Oct 30, 2012Cercacor Laboratories, Inc.Multiple wavelength sensor emitters
US8306596Sep 22, 2010Nov 6, 2012Glt Acquisition Corp.Method for data reduction and calibration of an OCT-based physiological monitor
US8310336Oct 14, 2010Nov 13, 2012Masimo CorporationSystems and methods for storing, analyzing, retrieving and displaying streaming medical data
US8315683Sep 20, 2007Nov 20, 2012Masimo CorporationDuo connector patient cable
US8337403Oct 20, 2008Dec 25, 2012Masimo CorporationPatient monitor having context-based sensitivity adjustments
US8346330Oct 12, 2009Jan 1, 2013Masimo CorporationReflection-detector sensor position indicator
US8353842Dec 23, 2008Jan 15, 2013Masimo CorporationPortable patient monitor
US8355766Oct 9, 2008Jan 15, 2013Masimo CorporationCeramic emitter substrate
US8364223May 3, 2006Jan 29, 2013Masimo CorporationPhysiological monitor
US8374665Apr 21, 2008Feb 12, 2013Cercacor Laboratories, Inc.Tissue profile wellness monitor
US8385995Aug 6, 2007Feb 26, 2013Masimo CorporationPhysiological parameter tracking system
US8385996Apr 13, 2009Feb 26, 2013Cercacor Laboratories, Inc.Multiple wavelength sensor emitters
US8399822Mar 22, 2011Mar 19, 2013Masimo CorporationSystems and methods for indicating an amount of use of a sensor
US8401602Oct 12, 2009Mar 19, 2013Masimo CorporationSecondary-emitter sensor position indicator
US8405608Feb 28, 2008Mar 26, 2013Masimo CorporationSystem and method for altering a display mode
US8412297Jul 28, 2006Apr 2, 2013Covidien LpForehead sensor placement
US8414499Dec 7, 2007Apr 9, 2013Masimo CorporationPlethysmograph variability processor
US8418524Jun 11, 2010Apr 16, 2013Masimo CorporationNon-invasive sensor calibration device
US8423106Mar 10, 2008Apr 16, 2013Cercacor Laboratories, Inc.Multi-wavelength physiological monitor
US8428967May 18, 2011Apr 23, 2013Cercacor Laboratories, Inc.Spot check monitor credit system
US8430817Oct 15, 2010Apr 30, 2013Masimo CorporationSystem for determining confidence in respiratory rate measurements
US8437825Jul 2, 2009May 7, 2013Cercacor Laboratories, Inc.Contoured protrusion for improving spectroscopic measurement of blood constituents
US8447374Oct 9, 2008May 21, 2013Ceracor Laboratories, Inc.Systems and methods for determining blood oxygen saturation values using complex number encoding
US8452367Jul 26, 2010May 28, 2013Covidien LpForehead sensor placement
US8457703Nov 13, 2007Jun 4, 2013Masimo CorporationLow power pulse oximeter
US8457707Sep 19, 2007Jun 4, 2013Masimo CorporationCongenital heart disease monitor
US8463349May 3, 2012Jun 11, 2013Masimo CorporationSignal processing apparatus
US8471713Jul 22, 2010Jun 25, 2013Cercacor Laboratories, Inc.Interference detector for patient monitor
US8473020Jul 27, 2010Jun 25, 2013Cercacor Laboratories, Inc.Non-invasive physiological sensor cover
US8483787Oct 31, 2011Jul 9, 2013Cercacor Laboratories, Inc.Multiple wavelength sensor drivers
US8489166Mar 21, 2008Jul 16, 2013Beijing Choice Electronic Technology Co., Ltd.Soft gum fingerstall oximeter without pivot structure
US8489364Aug 31, 2012Jul 16, 2013Masimo CorporationVariable indication estimator
US8498684Mar 8, 2011Jul 30, 2013Masimo CorporationSine saturation transform
US8515509Aug 3, 2009Aug 20, 2013Cercacor Laboratories, Inc.Multi-stream emitter for noninvasive measurement of blood constituents
US8515511Sep 29, 2009Aug 20, 2013Covidien LpSensor with an optical coupling material to improve plethysmographic measurements and method of using the same
US8515515Mar 11, 2010Aug 20, 2013Covidien LpMedical sensor with compressible light barrier and technique for using the same
US8529301Feb 17, 2012Sep 10, 2013Masimo CorporationShielded connector assembly
US8532727Aug 20, 2007Sep 10, 2013Masimo CorporationDual-mode pulse oximeter
US8532728Dec 29, 2008Sep 10, 2013Masimo CorporationPulse oximeter probe-off detector
US8543181Oct 6, 2010Sep 24, 2013General Electric CompanySensor holder for medical sensor
US8547209May 21, 2012Oct 1, 2013Masimo CorporationAlarm suspend system
US8548548Nov 29, 2010Oct 1, 2013Masimo CorporationPhysiological measurement communications adapter
US8548549Sep 9, 2011Oct 1, 2013Glt Acquisition Corp.Methods for noninvasively measuring analyte levels in a subject
US8548550Jul 31, 2012Oct 1, 2013Cercacor Laboratories, Inc.Optical sensor including disposable and reusable elements
US8560032May 22, 2012Oct 15, 2013Cercacor Laboratories, Inc.Noninvasive multi-parameter patient monitor
US8570167Jul 24, 2012Oct 29, 2013Masimo CorporationPhysiological trend monitor
US8570503Jun 15, 2012Oct 29, 2013Cercacor Laboratories, Inc.Heat sink for noninvasive medical sensor
US8571617Mar 4, 2009Oct 29, 2013Glt Acquisition Corp.Flowometry in optical coherence tomography for analyte level estimation
US8571618Sep 27, 2010Oct 29, 2013Cercacor Laboratories, Inc.Adaptive calibration system for spectrophotometric measurements
US8571619May 19, 2010Oct 29, 2013Masimo CorporationHemoglobin display and patient treatment
US8577431Jul 2, 2009Nov 5, 2013Cercacor Laboratories, Inc.Noise shielding for a noninvasive device
US8581732Mar 5, 2012Nov 12, 2013Carcacor Laboratories, Inc.Noninvasive multi-parameter patient monitor
US8584345Mar 7, 2011Nov 19, 2013Masimo CorporationReprocessing of a physiological sensor
US8588880Feb 16, 2010Nov 19, 2013Masimo CorporationEar sensor
US8600467Jul 1, 2010Dec 3, 2013Cercacor Laboratories, Inc.Optical sensor including disposable and reusable elements
US8606342Oct 31, 2005Dec 10, 2013Cercacor Laboratories, Inc.Pulse and active pulse spectraphotometry
US8626255May 22, 2012Jan 7, 2014Cercacor Laboratories, Inc.Noninvasive multi-parameter patient monitor
US8630691Aug 3, 2009Jan 14, 2014Cercacor Laboratories, Inc.Multi-stream sensor front ends for noninvasive measurement of blood constituents
US8634889May 18, 2010Jan 21, 2014Cercacor Laboratories, Inc.Configurable physiological measurement system
US8641631Apr 8, 2005Feb 4, 2014Masimo CorporationNon-invasive monitoring of respiratory rate, heart rate and apnea
US8652060Jan 22, 2008Feb 18, 2014Masimo CorporationPerfusion trend indicator
US8663107May 3, 2011Mar 4, 2014Cercacor Laboratories, Inc.Sepsis monitor
US8666468May 4, 2011Mar 4, 2014Masimo CorporationPatient monitor for determining microcirculation state
US8667967Sep 1, 2011Mar 11, 2014Masimo CorporationRespiratory monitoring
US8670811Jun 25, 2010Mar 11, 2014Masimo CorporationPulse oximetry system for adjusting medical ventilation
US8670814Jan 27, 2009Mar 11, 2014Masimo CorporationLow-noise optical probes for reducing ambient noise
US8676286Jan 3, 2011Mar 18, 2014Cercacor Laboratories, Inc.Method and apparatus for reducing coupling between signals in a measurement system
US8682407May 3, 2011Mar 25, 2014Masimo CorporationCyanotic infant sensor
US8688183Sep 2, 2010Apr 1, 2014Ceracor Laboratories, Inc.Emitter driver for noninvasive patient monitor
US8690799Oct 14, 2010Apr 8, 2014Masimo CorporationAcoustic respiratory monitoring sensor having multiple sensing elements
US8692992Sep 22, 2011Apr 8, 2014Covidien LpFaraday shield integrated into sensor bandage
US8700112Feb 28, 2013Apr 15, 2014Masimo CorporationSecondary-emitter sensor position indicator
US8702627Oct 14, 2010Apr 22, 2014Masimo CorporationAcoustic respiratory monitoring sensor having multiple sensing elements
US8706179May 7, 2012Apr 22, 2014Masimo CorporationReusable pulse oximeter probe and disposable bandage apparatii
US8712494May 2, 2011Apr 29, 2014Masimo CorporationReflective non-invasive sensor
US8715206Oct 14, 2010May 6, 2014Masimo CorporationAcoustic patient sensor
US8718735Jun 3, 2011May 6, 2014Cercacor Laboratories, Inc.Physiological parameter confidence measure
US8718737Apr 2, 2012May 6, 2014Masimo CorporationMethod and apparatus for demodulating signals in a pulse oximetry system
US8720249Apr 11, 2013May 13, 2014Masimo CorporationNon-invasive sensor calibration device
US8721541Jan 18, 2013May 13, 2014Masimo CorporationPhysiological monitor
US8721542Aug 7, 2008May 13, 2014Masimo CorporationPhysiological parameter system
US8723677Oct 19, 2011May 13, 2014Masimo CorporationPatient safety system with automatically adjusting bed
US8726496Sep 22, 2011May 20, 2014Covidien LpTechnique for remanufacturing a medical sensor
US8740792Jul 8, 2011Jun 3, 2014Masimo CorporationPatient monitor capable of accounting for environmental conditions
US8754776Jun 14, 2013Jun 17, 2014Cercacor Laboratories, Inc.Interference detector for patient monitor
US8755535Oct 14, 2010Jun 17, 2014Masimo CorporationAcoustic respiratory monitoring sensor having multiple sensing elements
US8755856Feb 22, 2012Jun 17, 2014Masimo CorporationSignal processing apparatus
US8755872Jul 27, 2012Jun 17, 2014Masimo CorporationPatient monitoring system for indicating an abnormal condition
US8761850Dec 21, 2012Jun 24, 2014Masimo CorporationReflection-detector sensor position indicator
US8761852Feb 17, 2010Jun 24, 2014Nonin Medical, Inc.Disposable oximeter device
US8764671Jun 26, 2008Jul 1, 2014Masimo CorporationDisposable active pulse sensor
US8768423Mar 4, 2009Jul 1, 2014Glt Acquisition Corp.Multispot monitoring for use in optical coherence tomography
US8771204Dec 21, 2009Jul 8, 2014Masimo CorporationAcoustic sensor assembly
US8781543Mar 26, 2012Jul 15, 2014Jpmorgan Chase Bank, National AssociationManual and automatic probe calibration
US8781544Mar 26, 2008Jul 15, 2014Cercacor Laboratories, Inc.Multiple wavelength optical sensor
US8781548Mar 11, 2010Jul 15, 2014Covidien LpMedical sensor with flexible components and technique for using the same
US8781549Aug 14, 2012Jul 15, 2014Cercacor Laboratories, Inc.Noninvasive oximetry optical sensor including disposable and reusable elements
US8788003Apr 25, 2012Jul 22, 2014Glt Acquisition Corp.Monitoring blood constituent levels in biological tissue
US8801613Dec 3, 2010Aug 12, 2014Masimo CorporationCalibration for multi-stage physiological monitors
US8821397Sep 27, 2011Sep 2, 2014Masimo CorporationDepth of consciousness monitor including oximeter
US8821415Oct 14, 2010Sep 2, 2014Masimo CorporationPhysiological acoustic monitoring system
US8830449Apr 17, 2012Sep 9, 2014Cercacor Laboratories, Inc.Blood analysis system
US8831700Jul 9, 2012Sep 9, 2014Glt Acquisition Corp.Apparatus and method for creating a stable optical interface
US8840549Sep 24, 2007Sep 23, 2014Masimo CorporationModular patient monitor
US20120113411 *Nov 9, 2010May 10, 2012Nellcor Puritan Bennett LlcOptical fiber sensors
USRE41317Apr 13, 2006May 4, 2010Masimo CorporationUniversal modular pulse oximeter probe for use with reusable and disposable patient attachment devices
USRE41912May 11, 2006Nov 2, 2010Masimo CorporationReusable pulse oximeter probe and disposable bandage apparatus
USRE42753Jul 2, 2009Sep 27, 2011Masimo Laboratories, Inc.Active pulse blood constituent monitoring
USRE43169Oct 5, 2009Feb 7, 2012Masimo CorporationUniversal modular pulse oximeter probe for use with reusable and disposable patient attachment devices
USRE43860Nov 1, 2010Dec 11, 2012Masimo CorporationReusable pulse oximeter probe and disposable bandage apparatus
USRE44823Feb 7, 2012Apr 1, 2014Masimo CorporationUniversal modular pulse oximeter probe for use with reusable and disposable patient attachment devices
USRE44875Mar 14, 2011Apr 29, 2014Cercacor Laboratories, Inc.Active pulse blood constituent monitoring
EP1083823A1 *Jun 2, 1999Mar 21, 2001Itamar Medical (C.M.) 1997 Ltd.Pressure applicator devices particularly useful for non-invasive detection of medical conditions
EP2129287A2 *Feb 27, 2008Dec 9, 2009Nonin Medical, IncFoldable sensor device and method of using same
EP2327358A1 *Nov 26, 2009Jun 1, 2011General Electric CompanySensor holder for medical sensor
WO1998015224A2Oct 2, 1997Apr 16, 1998Nellcor Puritan Bennett IncMotion compatible sensor for non-invasive optical blood analysis
WO1999063884A1 *Jun 2, 1999Dec 16, 1999Itamar Medical Cm 1997 LtdPressure applicator devices particularly useful for non-invasive detection of medical conditions
WO2006053141A1 *Nov 10, 2005May 18, 2006Nonin Medical IncSensor assembly
WO2008071643A1Dec 10, 2007Jun 19, 2008Cnsystems Medizintechnik GmbhDevice for continuous, non-invasive measurement of arterial blood pressure and uses thereof
Classifications
U.S. Classification600/407, 600/479, 356/41
International ClassificationG06Q20/00, A61B5/00
Cooperative ClassificationA61B5/6838, A61B5/6826, A61B5/14552, G06Q20/18
European ClassificationA61B5/1455N2, A61B5/68B2J1, A61B5/68B3L, G06Q20/18
Legal Events
DateCodeEventDescription
May 27, 2014ASAssignment
Owner name: JPMORGAN CHASE BANK, NATIONAL ASSOCIATION, ILLINOI
Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE NATURE OF CONVEYANCE PREVIOUSLY RECORDED AT REEL: 032784 FRAME: 0864. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT;ASSIGNORS:MASIMO AMERICAS, INC.;MASIMO CORPORATION;REEL/FRAME:033032/0426
Effective date: 20140423
Apr 29, 2014ASAssignment
Owner name: JPMORGAN CHASE BANK, NATIONAL ASSOCIATION, ILLINOI
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MASIMO CORPORATION;MASIMO AMERICAS, INC.;REEL/FRAME:032784/0864
Effective date: 20140423
Mar 17, 2006ASAssignment
Owner name: MASIMO CORPORATION, CALIFORNIA
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:COMERICA BANK;REEL/FRAME:017314/0694
Effective date: 20060310
Feb 15, 2006FPAYFee payment
Year of fee payment: 12
Feb 12, 2002FPAYFee payment
Year of fee payment: 8
Jun 21, 1999ASAssignment
Owner name: MASIMO CORPORATION, CALIFORNIA
Free format text: MERGER;ASSIGNOR:MASIMO CORPORATION;REEL/FRAME:010043/0066
Effective date: 19960620
Feb 9, 1998FPAYFee payment
Year of fee payment: 4
Jun 9, 1997ASAssignment
Owner name: COMERICA BANK-CALIFORNIA, CALIFORNIA
Free format text: SECURITY AGREEMENT;ASSIGNOR:MASIMO CORPORATION;REEL/FRAME:008587/0043
Effective date: 19970416
Sep 14, 1993ASAssignment
Owner name: MASIMO CORPORATION, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BRANIGAN, BRENDAN;REEL/FRAME:006687/0479
Effective date: 19930708